// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
#nullable disable
 
using Microsoft.CodeAnalysis.Text;
 
namespace Microsoft.CodeAnalysis.CommentSelection;
 
/// <summary>
/// Wrapper around a TextSpan that holds extra data used to create a tracking span.
/// </summary>
internal readonly struct CommentTrackingSpan
{
    public TextSpan TrackingTextSpan { get; }
 
    // In some cases, the tracking span needs to be adjusted by a specific amount after the changes have been applied.
    // These fields store the amount to adjust the span by after edits have been applied.
    // e.g. The selection begins in a comment -
    //    /*Com[|ment*/ int i = 1;|] -> /*Com*//*ment*/ int i = 1;*/
    // There are two new comment markers added inside the original comment, only the second should be selected.
    public int AmountToAddToTrackingSpanStart { get; }
    public int AmountToAddToTrackingSpanEnd { get; }
 
    public CommentTrackingSpan(TextSpan trackingTextSpan)
    {
        TrackingTextSpan = trackingTextSpan;
        AmountToAddToTrackingSpanStart = 0;
        AmountToAddToTrackingSpanEnd = 0;
    }
 
    public CommentTrackingSpan(TextSpan trackingTextSpan, int amountToAddToStart, int amountToAddToEnd)
    {
        TrackingTextSpan = trackingTextSpan;
        AmountToAddToTrackingSpanStart = amountToAddToStart;
        AmountToAddToTrackingSpanEnd = amountToAddToEnd;
    }
 
    public bool HasPostApplyChanges()
        => AmountToAddToTrackingSpanStart != 0 || AmountToAddToTrackingSpanEnd != 0;
}